Sewing machine and actuating mechanism therefor



K. MAIER June 24, 1930.

4 Sheets-Sheet 1 Filed July 23, 1928 June 24, 1930. M R I 1,765,927

SEWING MACHINE AND ACTUATING MECHANISM THEREFOR Filed July 23. 1928 4 Sheets-Sheet 2 June 24, 1930. k, M'AIER 1,765,927

SEWING MACHINE AND ACTUATING MECHANISM THEREFOR j Filed July 23, 1928 4 Sheets-Sheet 3 Jun 24, 1930. I 'K. MAIER 1,765,927

SEWING MACHINE AND ACTUATING MECHANISM THEREFOR Filed July 23, 1928 4 Sheets-Sheet 4 v gvwenkw 15 the shaft.

showing a slightly modified form of struc- Patented June 24, 1930 UNITED STATES PATENT OFFICE KARL HATER, OF STUTTGART, GERMANY, ASSIGNOB, TO UNION SPECIAL MASCHINEN- IEABRIK G. M. B. 3., OF STUT'IGART, GERMANY I SEWING- MAO'HINE AND ACT'El'ATING MECHANISM THEREFOR Application filed July 23,

The invention relates to new and useful improvements in sewing machines, and more particularly to the actuating mechanism of the sewing machine whereby the needle, logger, and feed are operated.

n object of the invention is to provide an actuating mechanism for the various parts'of a sewin 'machine which includes an actuating sha made in sections which enables a crank in the actuating shaft'to be removed for replacement or for interchanging with other types of crank actuating structures without interfering with the actuating parts operated by the remainder of A further object of the invention is to provide a machine of the above type wherein the bearing for the removable section of the shaft is mounted in a removable sleeve larger in diameter than the throw of the crank so that the crank and shaft section may be re- "moved with the sleeve.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings I Fig. 1 is a view partly in front elevation and partly in section showing a machine embodying the improvements.

elevation and partly in section showing one form of crank construction. Fig. 3 is a sectional view'on the line 33 of Fig. 2.

Fig. 4 is a view similar to Fig. 2, but

ture.

Fig. 5 is a sectional view on the line 5-5 of Fig. 4.

Fig. 6 is a view similar to Fig. 2 but showing a further modified form of structure.

Fig. 7 is a view similar to Fig. 6, but showing a still further modified form of crank I structure.

Fig. 8 is a view similar to Fig. 7 but showing a still further modified form of means for shifting the crank.

Fig. 9 is a view on the line 9-9 of Fig. 8.

Fig. 10. is a view partly in plan and partly Fig. 2, is an enlarged view partly in sidev in section of an actuating mechanism show- 1 1928. Serial N0. 294,710.

ing a modified arrangement of the sections of the main shaft between which the crank is located.

Fig. 11 is a view similar to Fig. 10 show-v ing the parts in a different position.

Fig. 12 is a diagrammatic view showing the crank in four different rotation.

The invention is directed to the actuating I mechanism of a sewing machine and more particularly the construction of the main ac-.

tuating shaft and the crank contained therein which imparts vibration to the needle lever. The main actuating shaft is located in a supporting bed structure on which the overhanging arm and standard are mounted. The end of this supporting bed structure adjacent the arm is provided with an openthe actuating shaft and the parts actuated.

thereby. There have been shown in the drawings several forms of frame structure capable of'accomplishing difierent results.

positions in its In a large measure these different crank.

structures are interchangeable. In the various forms of structure the crank pin 1s provided with a ball sleeve which can be re- 'moved and replaced to take up wear. This is made readily accessible by the sleeve referred to.

. Referring more in detail to the 'drawin 's, the sewing machine as illustrated inclu es the removal 'of asupporting bed structure 1 on which is detachably mounted an overhanging arm 2. Mounted in this bed structure is a main actuating shaft which is formed of two sections. The inner section is indicated at 3 and the outer section is indicated at 4. On the end of the section 3 is'a crank head 5 and on'the end of the section 4 is a crank head 6/ A crank pin 7 e is carried by the crank head 6 and makes detachable connection with the crank head 5. The section 4 of the shaft is mounted in a bearing 7 a which in turn is mounted'in a sleeve 8. The supporting bed structure 1 is provided with a circular opening which is closed by this sleeve 8. The sleeve 8 is detachably held in the opening in the bed structure and by removing this sleeve thesection 4 of the shaft and the crank head 6 carried thereby together with the. crank pin 7 may be removed from the machine.

The crank pin 7 as shown in Figs. 2 and 3 is formed integral with the crank head 6 and on this crank pin is a ball 9 with which a link 10 cooperates. On the end of the crank pin 7 there is a collar 11 which loosely fits on thecrank pin. This collar 11 has slabbed sides which engage in a slot 12 formed in the crank head 5. Thejcollar has portions 13 which overlie the side edges of the slot in the outer face of the crank head 5. This prevents the collar from slipping ofi of the crank pin 7. By the slotted cona greater throw. Thus'it will be seen that parts may be assembled to obtain the desired throw to the needle without in any way changing the actuating section of the shaft beneath the cloth plate or the parts operated thereby.

InFigs. 4 and 5 the crank pin 7 fits an opening in the crank head 5. This enables the section 4 of the shaft to be removed and interchanged with others in case that the .ball on the head cooperating with the link becomes worn. .In Fig. f the drawings the crank pin 7 is shown as detachably connected to the crank head 6. .The crank pin 'is provided with .a shoulder 14 and a clamping nut 15 draws this shoulder tightly against the crank head 6. The crank pin is also provided with a second shoulder 16 and a nut 17 holds this shoulder tightly against the crank head 5. Thus it is that the crank heads 5 and 6 are clamped together. By

' removing the nut 17 the section .4 of the shaft can be removed with the supporting k of the parts may be made without departing sleeve therefor, and in this case, a new cran pin substituted if .desired to take care of the wear in the parts. In Fig. 7 of the drawings the crank pin is mounted in a manner shown in Fig. 6 to the crank head 6, but has a'collar 18 on its other end'which engages a slot 19 in the crank head 5. This is shown in four different positions.

enables cranks of difierent throws to be substituted by an interchanging of the parts after the manner described above.

The crank head 6 in the form shown in Fig. 7 is also slotted as indicated at 20 and by loosening the nut 15 the crank pin can be set closer to or farther away from the center of the shaft section 4.

In Figs. 8 and 9 of the drawings the crank pin is shown as mounted in an eccentric sleeve 21 in the crank head 6. This eccentric sleeve 21 can be shifted and as it is shifted it will move the crank'pin toward or from the center of the shaft section 4. The eccentric sleeve is then locked or held in set position by the clamping nut 15.

In Figs. 10, 11, and 12 the shaft sect-ion 4 is shown as set in the supporting sleeve 8 with the center thereof out of alignment with the center of the shaft section 3. The

crank pin 7 is formed integral with the crank head 6 and carries a collar 22 which slides radially in a slot 23 formed in the crank head 5.

I These positions are indicated at a, b, c, and d. The shaft section 3 is'sectioned and the shaft section 4 is indicated by the broken line 4*. Thepath of travel of the crank pin is indicated by the broken line 24. .It will be apparent that the arrangement of the section 4 of the actuating shaft as indicated in these two figures of .the drawings provides 'a structure whereby the section 3 of the actuating shaft may be driven at a differential speed. Assuming the section 4 is traveling at a uniform speed then the section 3 will be traveling at its slowest speed when the crank In Fig. 12 the crank pin 7 pin is at the point a. The crank travels in the direction of the arrow in this figure and willlincrease the speed of the shaft section 3 as the crank passesto the position b and then to the position 0. From the position 0 to the position (i and back to the position a the speed decreased.

By changing the sleeves 8 and varying the extent ofeccentricity betweenthe axes of the shaft sections various speeds may be given to the shaft sectio'n beneath the cloth plate.

From the above'it will be apparent that the character and extent of the movements I imparted to the actuating parts may be greatly varied and all of the parts are read- My accessible for adjustment and replacement "and for interchanging.

It is obvious that minor changes in the details of construction and'the arrangement frame structure, a main actuating. shaft mounted thcrein'and formed in sections, a crank head on each section and a crank connecting said crank heads, a sleeve detachably supported in said frame structure and having a bearing for the outer vsection of said actuating shaft, said sleeve being of such dimensions as to permit a section of the actuating shaft carried thereby and the crank head attached thereto to be With drawn through the opening for the sleeve, the crank head on one of said sections being provided with a radial slot, said crank pin having a sleeve thereon disposed in said radial slot and freely movable therein, and

means formounting said crank pin on the other crank head so that it may be adjusted toward and from the axis of the actuating shaft.

2. In a sewing machine a supporting frame structure, a main actuating shaft mounted therein and formed in sections, a

crank head on each section and a crank connecting said crank heads, a sleeve detachably supported in said frame structure and having a bearing for the outer section of said actuating shaft, said sleeve being of such dimensions as to permit a section of the actuating shaft carried thereby and the crank head attached thereto to be Withdrawn through the opening for the sleeve the crank head onone of said sections being provided with a radial slot, said crank pin having a sleeve'thereon disposed in said radial slot and freely movable therein, said crank pin being mountedin an eccentric. sleeve carried by the other crank head, which sleeve may be adjusted and held in set positions for varying the distance of the crank pin from the axis of the actuating shaft.

3. Ina sewing machine, a supportingv frame structure, a main actuating shaft mounted therein and formed with an inner and an outer section, a sleeve detachably supported in said frame structure and ha"- mg a bearing for the outer section of said actuating shaft, a. crank head on the inner section and a crank head on the outer section. a crank fixed to said outer crank head and detachably connected to said inner crank head, said sleeve being of such dimensions as to permit theouter section of the actuating; shaft and the crank head and crank carried thereby to be withdrawn opening for the sleeve.

In testimony whereof, I afiix my signature.

KARL MAI ER.

through the 

